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Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified | Total | Common Shares | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock [Member] | Equity attributable to the owners of QIAGEN N.V. | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 2,291,169 | $ 2,711 | $ 1,622,733 | $ 615,579 | $ 50,146 |  | $ 2,291,169 |
Balance, shares at Dec. 31, 2009 |  | 232,074 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | 144,311 |  |  | 144,311 |  |  | 144,311 |
Unrealized gain (loss), net on hedging contracts | 9,807 |  |  |  | 9,807 |  | 9,807 |
Realized loss (gain) net on hedging contracts | (6,125) |  |  |  | (6,125) |  | (6,125) |
Unrealized gain (loss), net on pension | (129) |  |  |  | (129) |  | (129) |
Translation adjustment, net | 11,055 |  |  |  | 11,055 |  | 11,055 |
Common stock issuances under employee stock plans, shares |  | 1,041 |  |  |  |  |  |
Common stock issuances under employee stock plans | 11,241 | 13 | 11,228 |  |  |  | 11,241 |
Tax benefit of employee stock plans | 445 |  | 445 |  |  |  | 445 |
Share-based compensation | 13,592 |  | 13,592 |  |  |  | 13,592 |
Proceeds from subscription receivables | 987 |  | 987 |  |  |  | 987 |
Balance at Dec. 31, 2010 | 2,476,353 | 2,724 | 1,648,985 | 759,890 | 64,754 |  | 2,476,353 |
Balance, shares at Dec. 31, 2010 |  | 233,115 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Acquisition of Ipsogen S.A. | 42,437 |  |  |  |  |  |  | 42,437
Acquisition of Ipsogen S.A. shares from noncontrolling interests | (29,783) |  |  |  |  |  |  | (29,783)
Net income | 94,949 |  |  | 96,038 |  |  | 96,038 | (1,089)
Unrealized gain (loss), net on hedging contracts | 3,707 |  |  |  | 3,707 |  | 3,707 |
Realized loss (gain) net on hedging contracts | (2,825) |  |  |  | (2,825) |  | (2,825) |
Unrealized gain (loss), net on pension | 126 |  |  |  | 126 |  | 126 |
Translation adjustment, net | (51,929) |  |  |  | (49,858) |  | (49,858) | (2,071)
Common stock issuances under employee stock plans, shares |  | 1,106 |  |  |  |  |  |
Common stock issuances under employee stock plans | 8,778 | 15 | 8,763 |  |  |  | 8,778 |
Tax benefit of employee stock plans | (4,565) |  | (4,565) |  |  |  | (4,565) |
Share-based compensation | 19,539 |  | 19,539 |  |  |  | 19,539 |
Proceeds from subscription receivables | 1,011 |  | 1,011 |  |  |  | 1,011 |
Balance at Dec. 31, 2011 | 2,557,798 | 2,739 | 1,673,733 | 855,928 | 15,904 |  | 2,548,304 | 9,494
Balance, shares at Dec. 31, 2011 | 234,221 | 234,221 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Acquisition of Ipsogen S.A. shares from noncontrolling interests | (57) |  |  |  |  |  |  | (57)
Net income | 129,537 |  |  | 129,506 |  |  | 129,506 | 31
Unrealized gain (loss), net on hedging contracts | 209 |  |  |  | 209 |  | 209 |
Realized loss (gain) net on hedging contracts | 553 |  |  |  | 553 |  | 553 |
Unrealized gain (loss), net on pension | (598) |  |  |  | (598) |  | (598) |
Translation adjustment, net | 28,114 |  |  |  | 27,923 |  | 27,923 | 191
Purchase of treasury shares (in shares) |  |  |  |  |  | (1,943) |  |
Purchase of treasury shares | (35,653) |  |  |  |  | (35,653) | (35,653) |
Common stock issuances under employee stock plans, shares |  | 2,266 |  |  |  |  |  |
Common stock issuances under employee stock plans | 16,579 | 30 | 16,549 |  |  |  | 16,579 |
Tax benefit of employee stock plans | 1,489 |  | 1,489 |  |  |  | 1,489 |
Share-based compensation | 25,356 |  | 25,356 |  |  |  | 25,356 |
Proceeds from subscription receivables | 1,036 |  | 1,036 |  |  |  | 1,036 |
Balance at Dec. 31, 2012 | $ 2,724,363 | $ 2,769 | $ 1,718,163 | $ 985,434 | $ 43,991 | $ (35,653) | $ 2,714,704 | $ 9,659
Balance, shares at Dec. 31, 2012 | 236,487 | 236,487 |  |  |  | (1,943) |  |

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